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You  can  learn  about  computing  with  the 
least  expensive  computer  on  the  market 
by  attending  workshops  on: 


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■  Computer  Literacy 

■  Using  the  Timex  Sinclair  Computer  in 
the  classroom 

■  Demonstrations  of  applications  for 
use  in  daily  life,  e.g.,  home,  business,  lab, 
education  and  entertainment 

■  Seminars  on  how  to  start  your  own 
cottage  industry 
. .  .and  more! 


Join  the  Boston  Computer  Society's 
Sinclair-Timex  User  Group  in  celebrating 
their  second  anniversary  by  attending: 

The  Timex  Sinclair  Celebration 

Saturday,  October  22, 10AM-6PM 
Boston  Park  Plaza  Hotel 
Arlington  Street  and  Stuart  Street 
Boston,  MA 


Vendors  will  demonstrate  and  sell  products 
that  are  compatible  with  Timex  Sinclair 
computers,  e.g.,  peripherals,  software,  pub¬ 
lications,  and  services.  In  addition,  a  local 
Timex  Computer  retailer  will  have  a  full  line 
of  computer  products(hardware  and  soft¬ 
ware)  available,  including  the  T/S 1 500 


/ 


r  more  information  contact: 


The  Timex  Sinclair  Celebration 
RO.  Box  526 
Cambridge,  MA  02138 
617-354-7899  or  203-755-2699  or 


and  T/S  2068. 

Admission:  $3.00  general  admission 
$5.00  family 


The  Boston  Computer  Society 
3  Center  Plaza 
Boston,  MA  02108 
617-367-8080 


*  Discounts  for  members  of  other 
computer  user  groups,  students 
and  educators  (with  valid  ID) 


Design:  Richland  Design  Associates;  Cambridge,  MA 
Typesetting:  Serif  &  Sans;  Boston,  MA 


OQQQThe  Boston  Computer  Society 

SINClAiR-TIMEX  USER  GROUP  NEWSLETTER 

Volume  2,  Issue  10  October  1983 


This  newsletter  is  produced  to  inform  group  members  of  the  agenda  and 
logistics  for  future  meetings,  as  well  as  to  recap  and  amplify  the  information 
provided  at  the  last  meeting •  It  also  provides  a  forum  for  members  and 
interested  parties  to  communicate  what  they  have  learned  or  developed  relating 
to  Sinclair  and  Timex  computer  products.  Meetings  are  open  to  the  public; 
however,  attendees  are  encouraged  to  join  the  Boston  Computer  Society  (BCS). 
This  newsletter  is  free  to  members.  Back  issues  are  one  dollar  each. 


USER  GROUP  MEETING 

In  lieu  of  an  October  meeting,  we  are  having  a  special  Celebration,  a 
Sinclair-Timex  computer  show,  at  the  Boston  Park  Plaza  Hotel.  The  show  starts 
at  10:00  a.m.  and  runs  till  6:00  p.m.  Be  sure  to  be  there  to  see  Dan  Ross  and 
Maggy  Bruzelius  at  11:00.  In  fact,  interesting  things  will  be  happening  all 
day! 


Come  early  and  help  us  set  up,  and  contribute  some  time  selling  tickets, 
monitoring  one  of  the  exhibits,  recruiting  BCS  members,  or  any  of  the  many 
jobs  which  will  need  done.  Contact  Sue  (203-755-2699),  Will  Stackman 
(617-666-8626),  Jack  Hodgson  (617-354-7899),  or  Beth  Elliott  (617-742-4826)  to 
state  your  preference  for  jobs. 


DIRECTIONS  TO  THE  PARK  PLAZA 

BY  AUTO:  Take  the  Massachusetts  Turnpike  (190)  into  Boston.  Exit  at 
Prudential  Center/Coply  Square.  Follow  Coply  Square  signs  to  Stuart  Street. 
Follow  Stuart  Street  to  the  Boston  Park  Plaza.  Alternately,  you  can  leave 
your  car  at  the  Riverside  MBTA  station  (on  Route  128  one  exit  south  of  the 
Turnpike),  and  take  the  Blue  Line  to  Boston. 

BY  MBTA  (SUBWAY):  Take  the  Green  Line  to  Arlington  Street.  Walk  south 
on  Arlington  Street  to  the  Boston  Park  Plaza. 

ONCE  IN  THE  PARK  PLAZA,  GO  UP  TO  THE  MEZZANINE. 


NOVEMBER  MEETING 

In  November,  we  will  be  back  to  the  normal  routine.  The  meeting  will  be 
on  the  third  Wednesday  (16  November),  at  7:00  p.m.  Directions  are  on  the  back 
page.  Contact  Allan  Cohen  if  you  have  suggestions  or  presentations  for  the 
meeting . 


2 


WHY  A  COMPUTER  SHOW?  by  Susan  C.  T.  Mahoney 


Personally,  I  was  tired  of  hearing  ,fWhat  can  you  do  with  a  personal 
computer?"  not  to  mention,  "What  can  you  do  with  a  Timex  Sinclair?"  I  knew 
that  through  my  work  with  the  user  group  and  my  contacts  across  the  country 
that  there  were  a  lot  of  exciting  applications. 

To  me  it  was  obvious  that  we  needed  an  event  to  highlight  the 
accomplishments  and  achievements  of  the  group  members  and  bring  together 
Sinclair-Timex  computer  enthusiasts  with  exciting  applications  from  across  the 
country.  Developing  this  computer  show  is  the  most  exciting  and  challenging 
event  I  have  ever  organized.  I  met  obstacles  from  every  which  way  ranging 
from  obtaining  some  financial  backing  to  finding  volunteers  to  help  with 
publicity,  organizing,  and  implementing  the  show.  The  show  represents 
countless  hours  of  work  for  me  and  the  other  members  working  with  me  on  this 
project.  Everything  for  this  event  seems  to  come  at  the  eleventh  hour  which 
proves  that  perseverence  and  determination  does  pay  off. 

This  celebration  will  represent  the  best  and  the  largest  collection  of 
services,  products,  and  applications  that  are  available  to  owners  and 
prospective  buyers  of  the  Timex  computers  within  North  America.  As  the  time 
for  the  Celebration  approaches,  we  continue  to  receive  calls  from  individuals 
and  companies  from  across  the  country  who  want  to  participate  and  contribute 
to  the  event.  It  looks  like  we  are  going  to  have  a  very  exciting  day. 

I  would  like  to  again  thank  Reston  Publishing  for  believing  in  us  enough 
to  loan  us  money  to  put  on  the  show.  Also,  I  would  like  to  thank  Will 
Stackman,  Jack  Hodgson,  Beth  Elliott,  John  Kemeny,  Bob  Masters,  and  Bob  Heath 
for  their  contributions  to  this  event,  and  others  who  will  be  helping  on  the 
day  of  the  event . 

I'm  looking  forward  to  sharing  a  very  exciting  day  with  all  of  you  on 
Saturday,  October  22.  It  will  be  the  first  time  in  North  American  history 
that  so  many  vendors  that  support  Timex  computers  will  be  at  one  exhibit,  not 
to  mention  all  of  the  special  events,  exhibits,  and  seminars.  Please  bring 
your  friends  and  family — this  event  is  open  to  all! 


Special  Event 

11:00-12:30  Dan  Ross,  V.P.  Timex  Computer  Corporation,  and  Maggy  Bruzelius, 
Executive  V.P.  of  Sinclair  Research,  Limited,  will  discuss  the 
future  plans  of  their  respective  companies  and  the  importance 
of  third  party  support. 


Special  Exhibits 

History  Exhibit  hosted  by  Sinclair  Research,  Limited  and  the  Sinclair-Timex 
User  Group. 

Chess  Exhibit/ Tournament  sponsored  by  Sinclair-Timex  User  Group. 

Machine  Language  Clinic  sponsored  by  the  Machine  Language  Special  Interest 
Group. 


3 


Seminars 


Greg  Coffin,  Ph.D.,  Director  Urbans  Schools  Collaborative,  Northeastern 
University,  "Demonstration  of  Using  the  T/S  1500  in  the  Classroom  with  Boston 
Public  School  Students." 

Bob  Masters,  author  of  VU-CALC  and  The  Organizer:  Getting  Serious  with  Your 
Timex  Sinclair,  "VU-CALC  as  an  Electronic  Spreadsheet  Program  and  The 
Organizer  as  a  Personal  Filing  Program." 

Sandra  Hutchins,  Ph.D.,  Technical  Director  of  2  Bit  Software,  "Computer 
Literacy  Seminar:  An  Introduction  to  BASIC  Programming." 

Bill  Russell,  founder  and  designer  of  products  for  G.  Russell  Electronics, 

"The  Ins  and  Outs  of  Starting  Your  Own  Cottage  Industry." 

Dennis  J.  Krill,  member  of  the  Central  Pennsylvania  Timex-Sinclair  Computer 
User's  Group,  "Overview  of  Three  Types  of  Word  Processing  Programs  That  Can  Be 
Used  with  the  T/S  1000  Series  Computers." 

Rita  Carr,  member  of  the  San  Francisco  Bay  Area  Timex-Sinclair  User's  Group, 
"Bob  Orrfelt's  Program  to  Play  Scott  Joplin's  'Maple  Leaf  Rag.'" 

Eiger  Salt,  owner  of  Down  East  Computers,  "The  VOTEM  Analog  to  Digital 
Converter ." 

Jonna  Grammon,  United  Entertainment  Complex,  Madison  Avenue,  New  York  City, 
"Booking  Music  Groups:  A  Business  Application  of  Thomas  B.  Woods'  Data  Finder 
Program." 

Plus  others  on  business,  laboratory,  and  education  applications. 


Door  Prizes 

All  registered  attendees,  including  those  of  you  who  work  at  the  show, 
will  be  eligible  for  door  prizes.  You  need  not  be  present  to  win.  Some  of 
the  door  prizes,  which  have  been  identified  so  far,  include  a  T/S  2068 
computer  and  a  T/S  1500  computer  donated  by  Timex  Computer  Corporation,  a 
floppy  disk  drive  compatible  with  the  T/S  1000  and  T/S  1500  computers  donated 
by  Compusa,  subscriptions  to  Sync  and  Timex  Sinclair  User  magazines  donated  by 
their  respective  publishers,  MemoCalc  and  Memo Text  donated  by  Memotech,  and 
software  donated  by  Games  To  Learn  By,  Didicom,  Memotech,  and  2  Bit  Software. 


National  Participation 

We've  received  a  lot  of  positive  support  from  Sinclair-Timex  user  groups 
across  the  country,  many  of  which  are  sending  representatives  to  this  event. 
This  will  represent  the  first  gathering  of  user  groups  from  across  the 
country.  Hopefully,  this  is  just  the  start  of  communications  amoung  our 
groups  so  that  events  such  as  this  can  happen  on  a  more  frequent  basis. 


4 


Exhibitors 


2  Bit  Software,  Del  Mar,  California 

Atlantic  Northeast  Marketing,  Marblehead,  Massachusetts 
Byte  Back,  Leesville,  South  Carolina 

Compusa  (formerly  Centronic) ,  Mountainside,  New  Jersey 
CompuServe,  Columbus,  Ohio 
E-Z  Key,  Quincy,  Massachusetts 

G.  Russell  Electronics,  Centre  Hall,  Pennsylvania 
Games  to  Learn  By  (GTLB),  Williamsburg,  Massachussetts 
Gladstone  Electronics,  Buffalo,  New  York 
Integrated  Data  Systems,  Toronto,  Ontario 
Intercomputer,  Boston,  Massachusetts 
Kopak,  Union  City,  New  Jersey 

Memotech,  Denver,  Colorado/Needham,  Massachusetts 

Microsynch  Services,  Keene,  New  Hampshire 

Nissim  Elmaleh,  Fayetteville,  New  York 

Reston  Publishing,  Reston,  Virginia 

Softsync,  New  York,  New  York 

Syntax  ZX80,  Harvard,  Massachusetts 

Thomas  B.  Woods,  Jefferson,  New  Hampshire 

Timex  Computer  Corporation,  Waterbury,  Connecticut 

Timex  Sinclair  User  Magazine  (EEC  Publications),  Toronto,  Ontario 

Vidiom,  Providence,  Rhode  Island 

Ziff  Davis  Publishing  (Sync  Magazine),  New  York,  New  York 
Plus  others. 


OUTLINE  OF  THE  SINCLAIR  AND  TIMEX  COMPUTERS  by  Susan  C.  T.  Mahoney 

Below  is  an  outline  of  the  history  of  the  Sinclair  and  Timex  computers 
with  the  year  they  were  introduced,  type  of  computer,  its  qualities  (black  and 
white  or  color,  memory  size),  and  its  suggested  retail  price.  A  lot  of  power 
for  a  low  price!  Be  sure  to  see  the  history  exhibit  with  examples  of  all  of 
these  computers  plus  peripherals,  plus  a  time  line  showing  when  these  products 
were  introduced  in  the  U.K.  and  U.S. 


Year 

Computer 

B  &  W  or  Color 

1980 

ZX-80 

B  &  W 

1981 

ZX-81 

B  &  W 

1981 

ZX  Spectrum 
(U.K.  Release  Only) 

Color 

1982 

T/S  1000 

B  &  W 

1983 

2040  Printer 

1983 

T/S  1300 

B  &  W 

1983 

T/S  2068 

Color 

Memory  Size 

Retail  Price 

1  K  RAM,  4  K  ROM 

$199.95 

1  K  RAM,  8  K  ROM 

$149.95 

16  K  RAM,  8  K  ROM 

$249.90 

16  K  RAM,  16  K  ROM 

$200.00 

48  K  ROM,  16  K  ROM 

$250.00 

2  K  RAM,  8  K  ROM 

$  99.95- 

49.95 

16  K  RAM,  8  K  ROM 

$149.90- 

99.95 

$  99.95 

16  K  RAM,  8  K  ROM 

$  79.95 

(Expandable  to  32  K) 

48  K  RAM,  24  K  ROM 

$199.95 

5 


HISTORY  AND  BACKGROUND  ON  OUR  USER  GROUP  by  Susan  C.  T.  Mahoney 

This  month  will  mark  the  beginning  of  our  third  year  as  the 
Sinclair-Timex  User  Group.  The  user  group  is  a  group  of  individuals  who  get 
together  to  share  information  about  their  Sinclair  and  Timex  computers. 

During  the  past  two  years,  we  have  grown  from  18  members  to  800  members.  This 
fantastic  growth  is  indicative  of  the  excitement  and  enthusiasm  within  the 
group.  I'm  looking  forward  to  seeing  further  growth  in  our  group  and  more 
activities  and  participation  by  our  members. 


History  of  Our  Group 

During  the  summer  of  1981,  I  was  working  for  the  U.S.  headquarters  of 
Sinclair  Research,  Limited  in  Boston  planning  some  marketing  strategies  to 
introduce  Clive  Sinclair's  ZX-81  microcomputer  to  the  U.S.  market.  The  ZX-81 
had  already  been  introduced  in  Europe  and  was  doing  very  well,  especially  in 
the  U.K.  where  there  already  was  an  established  base  of  owners  of  the  ZX-80, 
the  forerunner  of  the  ZX-81. 

I  was  very  excited  because  Sinclair  was  the  first  to  come  out  with  a 
personal  computer  for  under  $200.00.  (In  those  days,  a  personal  computer  cost 
between  $500  and  $2500.)  Both  the  ZX-80  and  ZX-81  were  light  and  compact — 
only  12  ounces  and  6  1/2  inches  long,  not  much  larger  than  a  dessert  plate. 

Yet  the  Sinclair  computer  packed  a  lot  of  computing  power.  It  was  capable  of 
computing  (performing  number  crunching)  as  fast  as  most  personal  micro¬ 
computers.  It  could  run  useful  programs  for  home,  business,  school,  and 
entertainment.  However,  many  people  had  a  hard  time  taking  the  Sinclair 
computer  seriously  because  of  its  size  and  price. 

I  really  believed  that  the  Sinclair  computer  would  revolutionize  America 
because  of  its  low  cost  for,  not  only  the  computer,  but  also  the  hardware 
(peripherals  or  accessories)  and  the  software  (programs).  This  low  cost  would 
allow  anyone  interested  in  learning  more  about  a  computer  an  opportunity  to  do 
so.  This  would  spread  the  base  of  owners  and  users  so  that  we  would  see  new 
applications  being  developed  by  people  who,  prior  to  this  time,  never  thought 
of  owning  or  using  a  personal  computer! 

I  was  determined  to  find  out  what  owners  of  Sinclair  computers  were  using 
them  for  so  I  approached  Jonathan  Rotenberg,  President  of  the  Boston  Computer 
Society  (BCS) ,  to  ask  if  I  could  start  a  Sinclair  user  group.  He  gave  me 
permission  and  I  was  off  and  running.  Most  user  groups,  as  ours,  are  open  to 
the  public  on  a  trial  basis;  however,  regular  attendees  are  encouraged  to 
join.  Benefits  in  joining  the  BCS  include  not  only  membership  in  our  group, 
but  also  an  opportunity  to  join  the  27  other  user  groups  of  the  BCS,  receive 
Computer  Update,  a  bimonthly  magazine,  attend  workshops,  amd  other  benefits. 

BCS  user  group  directors  are  responsible  for  finding  their  own  free 
meeting  space  since  none  of  us  have  a  budget  for  rental  of  space. 

Consequently,  I  arranged  for  our  user  group's  first  meeting  to  take  place  in  a 
store  front  operation  in  Kenmore  Square  in  Boston.  Eighteen  people  showed  up 
at  the  first  meeting  to  exchanged  ideas  and  discussed  questions  regarding  the 
ZX-80  and  the  ZX-81.  It  felt  like  we  were  off  to  a  good  start.  However,  two 
days  before  the  second  meeting,  I  found  out  that  the  company  that  had  allowed 
us  to  use  their  space  had  filed  for  bankruptcy  and  we  had  to  find  another 
meeting  place.  I  found  an  alternate  spot  in  time  to  keep  the  second  meeting. 

Our  group  kept  growing,  even  though  we  did  not  have  a  permanent  home. 
After  outgrowing  three  meeting  places,  we  were  offered  use  of  the  Science 


6 


Building  at  University  of  Massachusetts •  We  originally  met  in  the  Small 
Science  Auditorium  which  holds  125  persons.  We  moved  to  the  Large  Science 
Auditorium  on  our  first  anniversay  at  which  time  our  attendance  was  over  200! 
We  have  continued  meeting  at  University  of  Massachusetts  and  are  very  grateful 
to  Richard  Kane  from  the  Physics  Department  and  Joe  Lally  from  Continuing 
Education  who  got  us  permission  to  use  the  space. 


Format  of  Meetings 

Our  meetings  generally  include  one  to  three  main  presentations  by  a 
combination  of  members  and  outside  guests.  Guests  usually  represent  a  company 
that  produces  and  markets  hardware,  software,  services,  or  publications  that 
support  the  Sinclair-Timex  computer.  We  always  try  to  encourage  participation 
from  our  members  and,  therefore,  allow  time  for  questions  and  announcements. 
After  announcements,  we  break  up  into  special  interest  groups,  the  subjects  of 
which  vary  according  to  the  interests  of  the  people  present . 


Special  Interest  Groups 

On-going  special  interest  groups  within  the  Sinclair-Timex  User  Group 
include  the  Beginner's  Group  and  the  Machine  Language  Group.  The  Beginner's 
Group  meets  directly  after  our  general  monthly  meeting  to  help  beginners  or 
prospective  Timex  buyers.  We  answer  questions  and  exchange  information.  The 
Machine  Language  Group  meets  first  Wednesday  of  the  month.  At  this  special 
meeting,  advanced  users  discuss  various  aspects  of:  the  Sinclair-Timex  hardware 
and  machine  language  programming  that  are  too  detailed  for  our  general  meeting. 


Services 

Services  available  to  our  members  which  include  our  library,  this 
newsletter,  newsletter  exchange,  and  free  advice.  You  can  check  out  books, 
magazines,  and  public  domain  software  from  our  library.  We  always  are 
actively  looking  for  donations.  We  have  a  monthly  newsletter  which  has 
expanded  from  a  one-page  handwritten  document  to  a  12  page  newsletter  with 
highlights  of  the  past  meetings  and  agenda  for  the  upcoming  meetings.  It 
normally  contains  articles  on  aspects  of  the  computer,  software  and  hardware 
reviews,  editorials,  and  interviews.  We  exchange  our  newsletter  with  other 
groups  across  the  country  to  keep  track  of  who  is  doing  what.  You  can  have 
access  to  these  newsletters  through  our  library.  Most  members  are  willing  to 
help  each  other  with  questions,  on  an  informal  basis. 


Benefits 

Benefits  you  receive  from  the  group  are  related  to  the  extent  of  your 
involvement.  The  benefits  I  have  received  as  founder  and  director  of  the 
group  are  many.  For  one  thing,  this  group  has  provided  an  opportunity  for  me 
to  meet  very  interesting  and  exciting  individuals  and  companies.  Because  of 
my  work  with  this  group,  I  have  received  phone  calls  from  people  literally  all 
over  the  U.S.  and  Canada.  These  calls  have  included  inquiries  about  the 
Sinclair-Timex  computers  and  exchanges  of  information  about  the  various  user 
groups  across  the  country.  Professionally,  I  developed  a  consulting  and  later 
a  staff  position  with  Timex  Computer  Corporation.  I  also  have  worked  with 
publishers  in  reviewing  books  on  the  computer,  as  well  as  referring  other 
members  of  our  group  to  review  books  or  products. 


7 


HIGHLIGHTS  OF  THE  SEPTEMBER  MEETING 


A  disk  drive  was  demonstrated  and  two  modems  were  reviewed  at  our  last 
meeting.  Additionally,  we  continued  our  planning  for  our  Second  Anniversary 
Celebration . 

Frank  Kaplan  from  Compusa  Corporation,  Mountainside,  New  Jersey 
demonstrated  a  prototype  of  the  FDC— 101  floppy  disk  system.  Compusa  is  a 
division  of  Centronic,  Inc.  (not  to  be  confused  with  the  New  Hampshire-based 
printer  manufacture,  Centronics).  A  previous  Sinclair— Timex  product  developed 
by  Centronic  is  the  Fizz  Board,  a  floppy  disk  system  with  far  less  capability 
than  the  FDC-101. 

The  heart  of  the  floppy  disk  system  is  the  FDC-100  controller  board. 

This  printed  circuit  board  contains  the  floppy  disk  controller  and  a  2732  ROM 
containing  the  disk  operating  system  (DOS) .  The  controller  plugs  into  the 
edge  connector  of  the  computer,  drawing  it  power  from  the  computer,  and  has 
cables  for  interface  with  two  floppy  disk  units.  Initially,  the  controller 
will  be  delivered  without  a  dust  cover. 

The  controller  will  work  with  many  standard  disk  drives — single  and 
double  density,  single  and  double  sided.  User  interface  with  the  control  is 
accomplished  with  the  Sinclair  LOAD  and  SAVE  commands  by  using,  in  place  of 
standard  file  names,  commands  to  the  disk.  PEEKs  and  POKEs  are  not  required. 
The  syntax  is  such  that  the  BASIC  interpreter  is  happy  and,  if  disk  access  is 
not  intended,  the  file  will  be  written  to  or  retrieved  to  the  standard 
cassette  tape  interface.  Disk  operations  are  fast!  Large  programs  in  less 
than  10  seconds. 

The  DOS  supports  both  program  and  data  storage.  Programming  chaining, 
i.e.,  LOADing  a  self-running  program  from  within  a  running  program,  is 
supported.  Additionally,  the  DOS  can  LOAD  data  directly  into,  and  SAVE  data 
from,  a  variable  providing  data  input/output  capabilities.  Program  storage 
requires  one  track  per  program.  A  35— track  double— density  disk  will  hold  35 
6  Kbyte  programs  or  program  segments .  The  DOS  is  memory  mapped  into  the 
12-16  K  region,  but  can  be  configured  into  locations  8-12  K. 

The  controller  lists  for  $199.  Compusa  will  be  at  our  Celebration  and 
offering  a  preproduction  special.  The  special  price  is  $169.  The  ship  date 
for  production  units  is  early  November.  Compusa  also  sells  complete  floppy 
disk  systems.  Systems  include  the  controller,  one  or  two  disk  drives  with 
case,  and  power  supplies.  For  a  single-sided  35— track  disk  system,  the  price 
is  $499.  The  preproduction  special  is  $450.  Add  $49  for  a  double-density 
disk  drive. 

Jeff  Parker  followed  Frank  Kaplan's  demonstration  with  a  review  of  two 
modems,  both  from  Byte-Back.  Jeff  found  the  first  modem,  MD-1,  in  the 
Want  Advertiser.  The  second,  the  MD-2,  was  sent  to  him  by  Byte-Back  for 
review.  Jeff  described  both  modems  and  then  discussed  how  modems  can  be  used. 
See  Jeff's  article  for  details.  Computerized  bulletin  board  systems  (CBBS) 
and  information  system,  such  as  CompuServe,  were  amoung  the  uses  discussed. 
[Contributions  to  the  newsletter  can  submitted  electronically  with  such  a 
modem.]  It  was  stated,  however,  that  to  get  the  most  from  a  modem  and  the 
communications  possibilities  it  affords,  a  full-sized  keyboard  needs  to  be 
added  to  the  computer. 


8 


TURNING  YOUR  SINCLAIR-TIMEX  INTO  A  SMART  TERMINAL  by  Jeffrey  S.  Parker 

The  Byte-Back  Company  of  Leesville,  South  Carolina  is  one  of  the  first 
companies  to  manufacture  a  modem  for  the  Sinclair— Timex  computer.  Back-Byte 
produces  an  affordable  and  versatile  modem,  completely  compatible  with  your 
T/ S  1000,  T/ S  1500,  and  ZX— 81.  The  modem,  the  MD— 2,  is  a  direct  connect 
modem,  plugging  directly  into  the  telephone  wall  connector.  It  connects  to 
the  computer's  edge  connector  and  has  a  through  connector  for  add  on  of  other 
peripherals •  It  incorporates  an  RS— 232  port  for  hookup  to  any  RS— 232 
compatible  device,  such  as  a  printer.  It  has  its  own  on/off  switch.  The  MD-2 
comes  in  an  attractive  low-profile  case,  similar  in  design  to  a  Memotech 
product.  It  can  be  purchased  as  a  kit  or  fully  assembled.  The  kit  price  is 
$119.95;  the  price  for  the  assembled  and  tested  version  is  $149.95.  Byte-Back 
offers  a  90  day  limited  warranty  on  all  parts  and  workmanship.  The  warranty 
is  slightly  modified  for  you  daring  kit  builders. 

A  note  of  caution:  kit  assembly  should  not  be  attempted  by  a  novice. 
There  are  no  unusal  characteristics  to  the  modem,  however.  If  you  assembled 
your  computer,  you  should  be  able  to  enjoy  the  thrill  of  building  your  own 
MD-2.  Jerry  Minchey,  the  owner  of  Byte-Back  and  one  of  several  staff 

»  is  on  tap  from  7  to  10  p.m.  weeknights  to  help  kit  builders. 

While  there  is  no  question  about  the  quality  of  the  hardware,  the 
software  which  accompanies  the  modem  is  extremely  well  written  and 
extraordinarily  versatile.  The  program  driving  the  modem  is  called  ZC0MM. 

The  program  loads  reliably.  There  is  both  a  2  K  version  and  a  16/64  K  version 
of  ZCOMM.  The  program  user's  manual  is  easy  to  follow  and  complete,  and 
contains  a  program  listing  to  facilitate  user  modifications.  With  ZCOMM,  the 
modem  can  be  used  to  originate  a  call  to  a  host  computer  or  answer  one  from 
another  terminal.  The  2  K  version  of  ZCOMM  will  use  an  RS-232  printer  or  the 
T/S  2040  printer  in  one  of  two  modes:  continuous  print  and  on-command  print 
of  the  contents  of  the  screen.  The  print  option  is  activated  and  deactivated 
with  a  single  key  command.  The  16/64  K  version  allows  all  of  these  functions 
plus  the  capability  to  upload  and  download  a  program  to  and  from  your  host 
computer.  It  also  allows  the  transmission  and  receipt  of  variables,  all  by 
easy  to  use  keyboard  commands. 

Byte-Back's  previous  modem,  the  MD-1 ,  is  no  longer  in  production,  having 
been  replaced  by  the  MD— 2.  The  chief  differences  between  the  two  modems  are 
the  shape  of  the  case  (the  MD-1  is  tall  rectangular  versus  low-profile), 
internal  construction  (two  boards  in  a  piggy  back  arrangement  in  the  MD-1 
versus  a  single  board  in  the  MD-2) ,  and  circuitry  such  that  the  MD-2  does  not 
require  the  telephone  receiver  to  remain  off  hook  after  call  setup.  Also  the 
MD-1  did  not  have  the  power  switch. 

If  you  can  purchase  an  MD-1  modem  from  a  private  party,  I  recommend  it. 
The  quality  is  extremely  high,  and  barring  abuse,  the  hardware  will  last.  It 
is  not,  of  course,  the  current  model  and  so  slightly  less  capable.  But,  you 
can  purchase  both  a  case  and  a  software  upgrade  for  the  MD-1  from  Byte-Back 
for  $44.90,  including  shipping  and  handling. 

If  you  crave  adventure  in  the  new  world  of  telecommunications ,  if  you've 
ever  felt  intimidated  by  your  neighbors  Apple  lie,  or  if  you  want  to  enjoy  the 
luxury  of  instant  news,  banking,  and  travel  and  product  information,  get  a 
modem.  It  will  allow  access  to  a  broad  base  of  computing  capabilities,  right 
from  your  little  machine.  What  are  you  waiting  for? 


9 


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(MEASURES  10"  x  4")  THAT  PLUGS  INTO  THE  SAME 
CONNECTORS  AS  EXISTING  KEYBOARD  ON  YOUR 
ZX81  OR  TIMEX  SINCLAIR  1000.  IT  HAS  ALL 
SILKSCREENED  LEGENDS  IN  3  COLORS  ON  THE 
BASE;  MOLDED  LEGENDS  &  GRAPHICS  ON  KEY  TOPS; 
8  AUTOMATIC  SHIFT  KEYS  (NO  SHIFTING  REQUIRED) 
FOR  EDIT,  DELETE,  SINGLE  &  DOUBLE  QUOTES. 
COLON.  SEMI-COLON,  FUNCTION  &  STOP;  5"  SPACE 
BAR;  2  SHIFT  KEYS;  NUMERIC  KEY  PAD. 


ONLY  $84.95 


MASS.  RESIDENTS  ADD  5%  SALES  TAX 
SHIPPING  &  HANDLING  $4.00/UNIT 

QUANTITY  DISCOUNTS.  WE 
WILL  ACCEPT  MC/VISA.  PLEASE  INCLUDE  #’S,  EXP. 
DATE  AND  SIGNATURE.  FOR  MORE  INFORMATION 
SEND  SASE.  SEND  INQUIRIES,  CHECK  OR  MONEY 
ORDER  TO:  E-Z  KEY 

SUITE  75 

711  SOUTHERN  ARTERY 
QUINCY,  MA  02169 


BUFFERING  THE  DATA  BUS 

In  the  last  newsletter,  we  described  a  technique  for  buffering  the  data 
bus  on  the  ZX-81  and  T/ S  1000  to  reduce  the  deteriorative  effects  of  adding 
peripherals  to  the  computer.  It  is  interesting  to  note  that  the  technique  we 
described  is  used  in  the  T/ S  1500,  i.e.,  the  T/ S  1500  uses  a  74LS245  octal  bus 
transceiver  chip  in  place  of  resistors  to  separate  the  data  bus. 


MACHINE  CODE  EXECUTION  ABOVE  32  K 

With  a  simple  change  to  your  computer  and  the  addition  of  one  logic  chip, 
it  is  possible  to  execute  machine  code  in  the  32  to  48  K  region  of  RAM  memory. 
The  technique  is^  described  in  the  "last11  issue  of  SQ.  The  technique  involves 
replacing  the  M^  signal  from  the  Z-80  chip  with  the  logical  "or"  of  the  M^ 
signal  and  the  inverted  A^  address  signal  (A, •  If  this  change  is  applied 
to  the  circuits  described  in  the  last  newsletter,  it  will  ensure  that  the 
transceiver  is  enabled  whenever  the  32  to  48  K  memory  region  is  addressed. 


ON  THE  TIMEX  PRINTER/ MEMOTECH  MEMORY  COMPATIBILITY  PROBLEM 

As  reported  in  the  last  newsletter,  a  solution  to  the  printer-memory 
incompatibility  is  clipping  three  capacitors.  Bob  Heath  has  done  this — it 
works!  The  printer  capacitors,  C4,  C5,  and  C6,  are  small  components,  not 
large  ones  as  previously  stated. 


10 


THE  CONTINUING  ADVENTURES  OF  THE  FLASHING  CURSOR  OR  HIGHLIGHTS  FROM  THE 
SEPTEMBER  MACHINE  LANGUAGE  GROUP  MEETING  by  Jack  Hodgson 


The  Machine  Language  (and  hardware  design)  Special  Interest  Group 
continues  to  be  a  small  but  enthusiastic  gathering.  In  September,  the  main 
activity  was  a  lively  discussion  of  a  new  piece  of  software  on  the  market 
which  allows  the  user  to  create  high-resolution  graphics  on  the  screen, 
completely  through  software.  Those  familiar  with  the  Sinclair  architecture 
realize  that  the  hardware  design  uses  timed  interrupts  to  pace  the  television 
display  and  that  the  table  of  pixel  (picture  element)  information  must  be 
located  below  the  8  K  boundary.  The  software  reviewed  disables  the  interupts 
and  generates  the  screen  from  its  own  routines,  pacing  the  display  by  keeping 
precise  track  of  the  number  of  instruction  cycles  that  have  been  executed.  A 
continuation  of  this  discussion  and  a  demonstration  is  planned  for  a  future 
meeting . 

Mike  Coughlin  gave  a  short  briefing  of  new  chips  that  are  coming  on  the 
market  with  a  special  emphasis  on  memories  that  can  be  installed  within  the 
computer . 

Dave  Wood,  who  led  the  high-resolution  graphics  discussion,  once  again 
attempted  to  demonstrate  his  word  processor  with  its  amazing  flashing  cursor, 
but  the  fates  were  not  with  us,  and  hardware  problems  made  the  unveiling 
impossible.  Another  attempt  is  expected  in  October  which  we  await  with  byted 
breath. 


The  Machine  Language  Special  Interest  Group  meets  on  the  first  Wednesday 
of  the  month  at  7:00  p.m.  at  ITEK  Optical  in  Lexington,  Massachusetts.  For 
directions  and  to  let  us  know  you're  coming,  call  Bob  Heath  at  276-2424  (work). 


How  will  you  take  your 
SYNTAX  /  Syntax  Quarterly? 

The  Combination  — 12  issues  SYNTAX,  4 

issues  SQ  $39 

The  Catch-up-SYNTAX  Jan.  82-Dec.  83, 

SQ  Nov.  82-Nov.  83  (5  issues),  1  binder  $77 

The  Works -SYNTAX  Nov.  80-Nov.  83, 

SQ  Nov.  82-Nov.  83  (5  issues),  2  binders  $97 

12  issues  of  SYNTAX)  $29 

4  issues  of  SQ,  Syntax  Quarterly  $15 

1  issue  SQ  □  Wintel  □  Spring  □  Summer  $  4.95 

1  Magazine  binder  to  liold  your  SYNTAX  or  SQ  $  9 

To  order  or  request  more  info,  call  617/456-3661.  Or 
write  SYNTAX/SQ,  RD  2  Box  457,  Harvard,  MA  01451. 

SYNTAX  /Syntax 

Quarterly  for  Timex 

Sinclair  computer 
users. 

SERIOUS  PROGRAMMERS 

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6  Turning  Mill  Road,  Lexington,  MA  02173 


4 


FOR  MORE  INFORMATION 


Sue  Mahoney,  Director  of  the  Sinclair-Timex  User  Group 
c/o  The  Boston  Computer  Society  or  call  (203)  755-2699 

Jack  Hodgson,  Publisher,  (617)  354-7899 
P.0.  Box  526,  Cambridge,  MA  02238 

Cliff  Danielson,  Editor,  (617)  256-4638 
14  Davis  Road,  Chelmsford,  MA  01824 

John  Kemeny,  Contributing  Editor  and  User  Group  Correspondent 
284  Great  Road,  Apt.  D5,  Acton,  MA  01720 

Beth  Elliott,  Librarian,  (617)  742-4826 

c/o  Sinclair  Research,  50  Staniford  Street,  Boston,  MA  02114 
Allan  Cohen,  Meeting  Coordinator,  (617)  961-3453 


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,  .jULAR  MEETING  (NOVEMBER):  The  Sinclair-Timex 

User  Group  meets  m  me  Large  Science  Auditorium  (Room  8/2/009)  of  the 
University  of  Massachussetts  of  Boston,  Harbor  Campus.  The  Harbor  Campus  is 
only  3  miles  from  downtown  Boston  and  easily  accessible  by  public  and  private 
transportation.  From  the  north  or  west,  take  the  Southeast  Expressway  to 
Exit  17.  Turn  left  onto  Columbia  Road.  Follow  construction  signs  to  ge  to 
Morrissey  Boulevard  in  the  direction  of  UMAS9  and  the  Kennedy  Library.  Bear 
right  on  the  traffic  island,  to  get  in  the  right  two  lanes,  following 
UMass/Boston  signs.  Turn  left  at  the  light  into  the  Campus.  From  the  south,, 
take  Morrissey  Boulevard  northward  to  the  campus.  On  the  MBTA,  take  the  Red 
Line  (Ashmont  Train)  to  Columbia  Station.  Transfer  to  the  free  University 
shuttlebus  in  the  T  parking  lot. 


QOThe  Boston 
DO  Computer  Society 


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P . 0 .  Box  63 

Des  Plaines,  IL  60017 


i  I  I  I !  ifiii  f  0  Util  f  Hi i  i  lJ  t  il  f  it 


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